Scientia Agricultura Sinica ›› 2006, Vol. 39 ›› Issue (8): 1605-1610 .doi: 10.3864/j.issn.0578-1752.at-2005-6210

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION • Previous Articles     Next Articles

Study on Microstructures Characteristics and Nutrition Slow/Controlled-Release Capability of Fertilizer Cores with Different Granulating Techniques and Their Coating CRFs

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  1. 华南农业大学新肥料资源研究中心
  • Received:2005-10-20 Revised:1900-01-01 Online:2006-08-10 Published:2006-08-10

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Abstract: 【Objective】To date, integrated research of production and consumption of CRFs is lacking. In order to conduct the research, fertilizer cores of CRFs were analyzed to discern improvement of CRF products' controlled-release performance. 【Method】An electron scanning microscope was used to study the core-coating microstructure of 4 fertilizer cores with different granulating processes and their coated CRFs. The influence of different granulating techniques on controlled release performance was analyzed according to a N leaching experiment of 2 CRFs with different cores. 【Result】When the air-cooling core and the disc-core were between the oil-cooled and drum cores, the oil-cooled-core had the smoothest surface, and the drum-core had a porous and coarse surface. While the tower-core and disc-core were between the oil-cooled and drum cores, the oil-cooled-core was very tidy and the drum core was loose. With the tower-core and disc-core in between, the oil-cooled-core had very high compactness in core- coating, the drum core had an obvious gap between core-coating. A soil-column leaching experiment showed that CRF with an oil-cooled-core had a much lower accumulated N leaching rate than that of CRF with drum-core. 【Conclusion】The performance of controlled-release was closely related to different core-coating microstructures. This paper analyzes and discovers the contribution of a CRF core to nutrient release capability improvement.

Key words: Granulating technique, Microstructure, Coat, Slow/ controlled-release capability

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